Finance question HELP!

Hanna Inc. has a proprietary bond-rating model and has determined the required return on the following Amerco bond is 7.5%. Assume the bond is being evaluated in
the current month of 2013 and matures in the current month of the year indicated. Based on this information, calculate the amount the bond is over- or
under-priced. Bond Amerco Coupon Maturity Last Price 9.125 2021 117.25 Answer: Over-priced by $76.05 I dont know how to get this answer, please show formulas that
you used to get that answer because I have a quiz on a this stuff and i want to know how to do it. Thanks